Investigation of superconducting gap structure in TbFeAsO0.9F0.1 using point contact Andreev reflection

K. A. Yates, K. Morrison, J. A. Rodgers, G. B. S. Penny, J-W G. Bos, J. P. Attfield, L. F. Cohen

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Bulk samples of TbFeAsO0.9F0.1 (T-c(on) = 50 K) were measured by point contact Andreev reflection spectroscopy. The spectra show unambiguous evidence for multiple gap-like features plus the presence of high-bias shoulders. By measuring the spectra as a function of temperature with both gold and superconducting niobium tips, we establish that the gap-like features are associated with the superconducting order parameter in this material. We discuss whether the well-defined zero-bias conductance peak that we observe infrequently is associated with a nodal superconducting order parameter.

Original languageEnglish
Article number025015
Pages (from-to)-
Number of pages10
JournalNew Journal of Physics
Publication statusPublished - 27 Feb 2009

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